[Cake] 5ms target hurting tcp throughput tweakable?

[Sebastian Moeller]

Looking at tc-adv, I would recommend to use “rtt 50” (maybe it is “rtt 50ms”) which allows to directly explicitly request a new “interval” (which IIRC is corresponding to the time you allow for the TCP control loop to react to cake’s ecn-marking/dropping) “target’ will be calculated as 5% of the explicit interval, in accordance with the rationale in the codel RFC.

Best Regards



> On Feb 26, 2017, at 15:34, Andy Furniss <adf.lists at gmail.com> wrote:
> 
> Jonathan Morton wrote:
>> 
>>> On 26 Feb, 2017, at 15:16, Andy Furniss <adf.lists at gmail.com> wrote:
>>> 
>>> Is there any way or plans to allow users to relax slightly the target?
>> 
>> You can do that by selecting a higher assumed RTT, for instance with the “oceanic” or “satellite” keywords.  This also increases the interval, which makes the AQM less aggressive in general.
> 
> Ok, thanks, I'll try.
> 
> I didn't know what the implications of "lying" about RTT were.
> 
> I do know that on a 60mbit ingress test I did to london = 10ms away, when I
> tried using metro = 10ms I killed single threaded throughput, so was
> wary of changing defaults after that.
> 
> 
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